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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * To change this template, choose Tools | Templates</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> * and open the template in the editor.</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <strong class="jxr_keyword">package</strong> com.googlecode.npuzzle.logic.astar;
<a class="jxr_linenumber" name="6" href="#6">6</a>   
<a class="jxr_linenumber" name="7" href="#7">7</a>   <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="8" href="#8">8</a>   <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="9" href="#9">9</a>   <strong class="jxr_keyword">import</strong> java.util.Set;
<a class="jxr_linenumber" name="10" href="#10">10</a>  
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_javadoccomment"> * @author thiago</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../com/googlecode/npuzzle/logic/astar/AStarTree.html">AStarTree</a> <strong class="jxr_keyword">implements</strong> <a href="../../../../../com/googlecode/npuzzle/logic/astar/PathFinder.html">PathFinder</a> {
<a class="jxr_linenumber" name="16" href="#16">16</a>  
<a class="jxr_linenumber" name="17" href="#17">17</a>      <strong class="jxr_keyword">private</strong> List&lt;Node&gt; open = <strong class="jxr_keyword">new</strong> BinaryList&lt;Node&gt;();
<a class="jxr_linenumber" name="18" href="#18">18</a>      <strong class="jxr_keyword">private</strong> List&lt;Node&gt; closed = <strong class="jxr_keyword">new</strong> ArrayList&lt;Node&gt;();
<a class="jxr_linenumber" name="19" href="#19">19</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> maxSearchDistance;
<a class="jxr_linenumber" name="20" href="#20">20</a>  
<a class="jxr_linenumber" name="21" href="#21">21</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/npuzzle/logic/astar/AStarTree.html">AStarTree</a>(<strong class="jxr_keyword">int</strong> maxSearchDistance) {
<a class="jxr_linenumber" name="22" href="#22">22</a>          <strong class="jxr_keyword">this</strong>.maxSearchDistance = maxSearchDistance;
<a class="jxr_linenumber" name="23" href="#23">23</a>      }
<a class="jxr_linenumber" name="24" href="#24">24</a>  
<a class="jxr_linenumber" name="25" href="#25">25</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/npuzzle/logic/astar/AStarTree.html">AStarTree</a>() {
<a class="jxr_linenumber" name="26" href="#26">26</a>          <strong class="jxr_keyword">this</strong>(Integer.MAX_VALUE);
<a class="jxr_linenumber" name="27" href="#27">27</a>      }
<a class="jxr_linenumber" name="28" href="#28">28</a>  
<a class="jxr_linenumber" name="29" href="#29">29</a>      @Override
<a class="jxr_linenumber" name="30" href="#30">30</a>      <strong class="jxr_keyword">public</strong> <a href="../../../../../com/googlecode/npuzzle/logic/astar/Path.html">Path</a> findPath(<a href="../../../../../com/googlecode/npuzzle/logic/astar/Node.html">Node</a> source, <a href="../../../../../com/googlecode/npuzzle/logic/astar/Node.html">Node</a> target) {
<a class="jxr_linenumber" name="31" href="#31">31</a>          source.setCost(0);
<a class="jxr_linenumber" name="32" href="#32">32</a>          source.setDepth(0);
<a class="jxr_linenumber" name="33" href="#33">33</a>          closed.clear();
<a class="jxr_linenumber" name="34" href="#34">34</a>          open.clear();
<a class="jxr_linenumber" name="35" href="#35">35</a>          open.add(source);
<a class="jxr_linenumber" name="36" href="#36">36</a>          target.setParent(<strong class="jxr_keyword">null</strong>);
<a class="jxr_linenumber" name="37" href="#37">37</a>  
<a class="jxr_linenumber" name="38" href="#38">38</a>          <strong class="jxr_keyword">int</strong> maxDepth = 0;
<a class="jxr_linenumber" name="39" href="#39">39</a>          <strong class="jxr_keyword">while</strong> ((maxDepth &lt; maxSearchDistance) &amp;&amp; (open.size() != 0)) {
<a class="jxr_linenumber" name="40" href="#40">40</a>              <a href="../../../../../com/googlecode/npuzzle/logic/astar/Node.html">Node</a> current = open.get(0);
<a class="jxr_linenumber" name="41" href="#41">41</a>              <strong class="jxr_keyword">if</strong> (current.equals(target)) {
<a class="jxr_linenumber" name="42" href="#42">42</a>                  target.setParent(current.getParent());
<a class="jxr_linenumber" name="43" href="#43">43</a>                  <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="44" href="#44">44</a>              }
<a class="jxr_linenumber" name="45" href="#45">45</a>              open.remove(current);
<a class="jxr_linenumber" name="46" href="#46">46</a>              closed.add(current);
<a class="jxr_linenumber" name="47" href="#47">47</a>  
<a class="jxr_linenumber" name="48" href="#48">48</a>              Set&lt;Node&gt; neighbours = current.getNeighbours();
<a class="jxr_linenumber" name="49" href="#49">49</a>              <strong class="jxr_keyword">for</strong> (Node neighbour : neighbours) {
<a class="jxr_linenumber" name="50" href="#50">50</a>                  <strong class="jxr_keyword">float</strong> nextStepCost = current.getCost() + getMovementCost(current, neighbour);
<a class="jxr_linenumber" name="51" href="#51">51</a>                  <strong class="jxr_keyword">if</strong> (nextStepCost &lt; neighbour.getCost()) {
<a class="jxr_linenumber" name="52" href="#52">52</a>                      <strong class="jxr_keyword">if</strong> (open.contains(neighbour)) {
<a class="jxr_linenumber" name="53" href="#53">53</a>                          open.remove(neighbour);
<a class="jxr_linenumber" name="54" href="#54">54</a>                      }
<a class="jxr_linenumber" name="55" href="#55">55</a>                      <strong class="jxr_keyword">if</strong> (closed.contains(neighbour)) {
<a class="jxr_linenumber" name="56" href="#56">56</a>                          closed.remove(neighbour);
<a class="jxr_linenumber" name="57" href="#57">57</a>                      }
<a class="jxr_linenumber" name="58" href="#58">58</a>                  }
<a class="jxr_linenumber" name="59" href="#59">59</a>  
<a class="jxr_linenumber" name="60" href="#60">60</a>                  <strong class="jxr_keyword">if</strong> (!open.contains(neighbour) &amp;&amp; !(closed.contains(neighbour))) {
<a class="jxr_linenumber" name="61" href="#61">61</a>                      neighbour.setCost(nextStepCost);
<a class="jxr_linenumber" name="62" href="#62">62</a>                      neighbour.setHeuristic(getHeuristicCost(neighbour, target));
<a class="jxr_linenumber" name="63" href="#63">63</a>                      maxDepth = Math.max(maxDepth, neighbour.setParent(current));
<a class="jxr_linenumber" name="64" href="#64">64</a>                      open.add(neighbour);
<a class="jxr_linenumber" name="65" href="#65">65</a>                  }
<a class="jxr_linenumber" name="66" href="#66">66</a>              }
<a class="jxr_linenumber" name="67" href="#67">67</a>          }
<a class="jxr_linenumber" name="68" href="#68">68</a>          <strong class="jxr_keyword">if</strong> (target.getParent() == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="69" href="#69">69</a>              <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/npuzzle/logic/astar/Path.html">Path</a>();
<a class="jxr_linenumber" name="70" href="#70">70</a>          }
<a class="jxr_linenumber" name="71" href="#71">71</a>  
<a class="jxr_linenumber" name="72" href="#72">72</a>          <a href="../../../../../com/googlecode/npuzzle/logic/astar/Path.html">Path</a> path = <strong class="jxr_keyword">new</strong> <a href="../../../../../com/googlecode/npuzzle/logic/astar/Path.html">Path</a>();
<a class="jxr_linenumber" name="73" href="#73">73</a>          <a href="../../../../../com/googlecode/npuzzle/logic/astar/Node.html">Node</a> aux = target;
<a class="jxr_linenumber" name="74" href="#74">74</a>          <strong class="jxr_keyword">while</strong> (aux != source) {
<a class="jxr_linenumber" name="75" href="#75">75</a>              path.prependStep(aux);
<a class="jxr_linenumber" name="76" href="#76">76</a>              aux = aux.getParent();
<a class="jxr_linenumber" name="77" href="#77">77</a>          }
<a class="jxr_linenumber" name="78" href="#78">78</a>          path.prependStep(aux);
<a class="jxr_linenumber" name="79" href="#79">79</a>          <strong class="jxr_keyword">return</strong> path;
<a class="jxr_linenumber" name="80" href="#80">80</a>      }
<a class="jxr_linenumber" name="81" href="#81">81</a>  
<a class="jxr_linenumber" name="82" href="#82">82</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">float</strong> getMovementCost(<a href="../../../../../com/googlecode/npuzzle/logic/astar/Node.html">Node</a> source, <a href="../../../../../com/googlecode/npuzzle/logic/astar/Node.html">Node</a> target) {
<a class="jxr_linenumber" name="83" href="#83">83</a>          <strong class="jxr_keyword">return</strong> 1.0f;
<a class="jxr_linenumber" name="84" href="#84">84</a>      }
<a class="jxr_linenumber" name="85" href="#85">85</a>  
<a class="jxr_linenumber" name="86" href="#86">86</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">float</strong> getHeuristicCost(<a href="../../../../../com/googlecode/npuzzle/logic/astar/Node.html">Node</a> source, <a href="../../../../../com/googlecode/npuzzle/logic/astar/Node.html">Node</a> target) {
<a class="jxr_linenumber" name="87" href="#87">87</a>          <strong class="jxr_keyword">return</strong> source.costDifference(target);
<a class="jxr_linenumber" name="88" href="#88">88</a>      }
<a class="jxr_linenumber" name="89" href="#89">89</a>  }
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